<?php

/**
 * Class for handling the metadata extensions for login and discovery user interface
 *
 * @link: http://docs.oasis-open.org/security/saml/Post2.0/sstc-saml-metadata-ui/v1.0/sstc-saml-metadata-ui-v1.0.pdf
 * @package simpleSAMLphp
 * @version $Id$
 */
class SAML2_XML_mdui_UIInfo {

	/**
	 * The namespace used for the UIInfo extension.
	 */
	const NS = 'urn:oasis:names:tc:SAML:metadata:ui';


	/**
	 * Array with child elements.
	 *
	 * The elements can be any of the other SAML2_XML_mdui_* elements.
	 *
	 * @var array
	 */
	public $children = array();

	/**
	 * The DisplayName, as an array of language => translation.
	 *
	 * @var array
	 */
	public $DisplayName = array();

	/**
	 * The Description, as an array of language => translation.
	 *
	 * @var array
	 */
	public $Description = array();

	/**
	 * The InformationURL, as an array of language => url.
	 *
	 * @var array
	 */
	public $InformationURL = array();

	/**
	 * The PrivacyStatementURL, as an array of language => url.
	 *
	 * @var array
	 */
	public $PrivacyStatementURL = array();

	/**
	 * The Keywords, as an array of language => array of strings.
	 *
	 * @var array
	 */
	public $Keywords = array();

	/**
	 * The Logo, as an array of associative arrays containing url, width, height, and optional lang.
	 *
	 * @var array
	 */
	public $Logo = array();


	/**
	 * Create a UIInfo element.
	 *
	 * @param DOMElement|NULL $xml  The XML element we should load.
	 */
	public function __construct(DOMElement $xml = NULL) {

		if ($xml === NULL) {
			return;
		}

		$this->DisplayName         = SAML2_Utils::extractLocalizedStrings($xml, self::NS, 'DisplayName');
		$this->Description         = SAML2_Utils::extractLocalizedStrings($xml, self::NS, 'Description');
		$this->InformationURL      = SAML2_Utils::extractLocalizedStrings($xml, self::NS, 'InformationURL');
		$this->PrivacyStatementURL = SAML2_Utils::extractLocalizedStrings($xml, self::NS, 'PrivacyStatementURL');

		foreach (SAML2_Utils::xpQuery($xml, './*') as $node) {
			if ($node->namespaceURI === self::NS) {
				switch ($node->localName) {
					case 'Keywords':
						$this->Keywords[] = new SAML2_XML_mdui_Keywords($node);
					break;
					case 'Logo':
						$this->Logo[] = new SAML2_XML_mdui_Logo($node);
					break;
				}
			} else {
				$this->children[] = new SAML2_XML_Chunk($node);
			}
		}
	}


	/**
	 * Convert this UIInfo to XML.
	 *
	 * @param DOMElement $parent  The element we should append to.
	 */
	public function toXML(DOMElement $parent) {
		assert('is_array($this->DisplayName)');
		assert('is_array($this->InformationURL)');
		assert('is_array($this->PrivacyStatementURL)');
		assert('is_array($this->Keywords)');
		assert('is_array($this->Logo)');
		assert('is_array($this->children)');

		if (!empty($this->DisplayName)
		 || !empty($this->Description)
		 || !empty($this->InformationURL)
		 || !empty($this->PrivacyStatementURL)
		 || !empty($this->Keywords)
		 || !empty($this->Logo)
		 || !empty($this->children)) {
			$doc = $parent->ownerDocument;

			$e = $doc->createElementNS(self::NS, 'mdui:UIInfo');
			$parent->appendChild($e);

			SAML2_Utils::addStrings($e, self::NS, 'mdui:DisplayName',         TRUE, $this->DisplayName);
			SAML2_Utils::addStrings($e, self::NS, 'mdui:Description',         TRUE, $this->Description);
			SAML2_Utils::addStrings($e, self::NS, 'mdui:InformationURL',      TRUE, $this->InformationURL);
			SAML2_Utils::addStrings($e, self::NS, 'mdui:PrivacyStatementURL', TRUE, $this->PrivacyStatementURL);

			if (!empty($this->Keywords)) {
				foreach ($this->Keywords as $child) {
					$child->toXML($e);
				}
			}

			if (!empty($this->Logo)) {
				foreach ($this->Logo as $child) {
					$child->toXML($e);
				}
			}

			if (!empty($this->children)) {
				foreach ($this->children as $child) {
					$child->toXML($e);
				}
			}
		}
		return $e;
	}

}
